Improvement in fire-alarm



tiuiieil '5mm ISAAC T. PE ASE, OF THOMPSONVILBE, CONNECTICUT, LettersPatent No. 87,194, dated February 23, 1869.1

IMPROVEMENT 1N FIRE-ALARM.

The Schedule ref-erreditoin these Letters Patentrand making pai't of thesame.

To all 'whom fit may concern:

Be it known that I, ISAAC T. PEASE, of Thompsonville, in the county ofHartford, and State of Connecticut,

side of `ig. l, with the bell .and alarm-mechanism rel' moved, to showthe parts relating to my invention more distinctly.

Figure 3 is a section through the middle of the expansion-bar.

Figure 4 is an end view of the same.

My invent-ion relates to that class of fire-alarms in which theexpansion ofa bar lets off an alarm when a fire takes place, and theheat ofthe apartment in which it occurs is raised above a Ygiventemperature.

A is the frame of the apparatus, to which the sev-` eral parts areattached.

B'is a tube, of some suitable metal, copper being preferably used, onaccount ofl its high heatconducting power, ductility, tenacity, andcheapness.

lhis tube is iilled with alcohol or some other highlyexpansive liquid,by the alteration in bulk ofwhich, in changes 0f temperature, one end ofthe tube B is made to move out or in, to lengthen or shorten thedistance between the extreme ends of the tube.

One end of the tube, which is shown in the drawings as larger than themain part, is furnished with a thin, iiexible metallic head, which ispressed out bythe expanding liquid, and is forced inward again by thepressure of the air when the fluid contracts., This end of the tube canbe made of the same size as the main part, ii' desired, the object beingto give it such a sizejuhat it will admit of expanding and contractin g,the required amount, without taking a permanent set.

The tube is iilledfull of the liquid, and sealed up, leaving noair-space inside.

This is done by leaving a small hole at the end b, either where the pino is inserted, or in some other convenient place, and filling the tubeentirely withthe liquid through that orifice.

The tube is then placed incold wat/er, to keep it cool, while theopening is soldered over` as quickly as.

possible.

Should there be any small space accidentally left within the tube, notoccupied by the liquid, the tube j can he slightly indented, to fill thevacancy. This` expansion-mechanism acts at one end against a standard,attached to the frame A, and at the other against a multiplying-lever,D, one end of which has a fulcrumattached to the frame A by a suitablestandard, anfd the other passes by a bend, near the end, -A under thedrop-lever E.

The expansion-mechanism acts nearthe fulcrum of the lever D, so as togive the bent end the necessary amount of motion, to regulate the escapeof the lever D from under E with suthcient exactness.

A spring, C, holds] the leverD againstthe end of the expansionmechanism.

The drop-lever E is furnished with a spring, e,vvhich holds it againstthe end of the lever D, andcauses it to drop against the frame A, whenreleased;

F is a common clock-alarm, the hammer of which strikes upon a bell, G.

This alarm is held, when Wound up, by the Wire H, resting in a nick inthe drop-lever E, and is released and set in motion bythe dropping of E,when released from D. The operation of my invention is as follows When alire occurs in the apartment where the improved alarm is placed, theheat expands' the enclosed liquid, and lengthens the expanding-mechanismB.

-This moves the lever D, releases the alarm by means of thelever E, andgives notice of the fire.

The apparatus may be set to give an alarm at any required degree oftemperature, by regulating the length of the escape-end of the lever D,reaching under the drop-lever E.

The apparatus is set by winding up the alarm, and replacing the parts inthe position described.

(Ylwims.

2.- The combination of the expanding-mechanism,

herein described, with a multiplying-lever, or levers, for the purposeof releasing and operating an alarm. ISAAC T. PEASE.

Witnesses:

GEO. A. PAINE, 2d, THEO. G. ELLIS.

